Fyrand, O. “Heparin-Precipitable Fraction (HPF) in an Unselected Material of Dermatological Inpatients”. Acta Dermato-Venereologica 54, no. 4 (July 1, 1974): 293–297. Accessed June 24, 2026. https://medicaljournalssweden.se/actadv/article/view/17687.